Add README for gulp asset pipeline

pipeline/README.md

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+## Gulp-based Asset Pipeline for Hugo Docs
+
+### Tools
+
+You can see details for the following development dependencies in package.json, as well as details about the build process in gulpfile.js.
+
+* Node 7.3.0
+* Gulp
+* Babel
+* JS Uglify
+* Autoprefixer
+* Imagemin
+* Image Resize
+    * **Note:** Configured to automatically resize and optimize images in the `source-images` directory but was *not* actively used during site development.
+* Concat
+* Rename
+
+
+### Gulpfile.js
+
+```js
+//gulpfile.js
+const gulp = require('gulp');
+const babel = require('gulp-babel');
+const concat = require('gulp-concat');
+const imagefull = 1200;
+const imagehalf = 450;
+const imagemin = require("gulp-imagemin");
+const imageresize = require('gulp-image-resize');
+const imagethumb = 80;
+const os = require("os");
+const parallel = require("concurrent-transform");
+const plumber = require('gulp-plumber');
+const pngquant = require('imagemin-pngquant');
+const prefix = require('gulp-autoprefixer');
+const pump = require('pump');
+const rename = require("gulp-rename");
+const sass = require('gulp-sass');
+const sassfiles = ["./scss/**/*.scss"];
+const sourcemaps = require('gulp-sourcemaps');
+const uglify = require('gulp-uglify');
+```